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State the principle of superposition of waves. What happens when phase differences between two waves are (i) 0 and (ii)π? -Physics CBSE class 11 20161 AnswerWhich of the following being used for applicationis such as assessing depth of oceans, thickness measurement, determination of the position of icebergs, flaw detection in metals, etc?0 AnswerWhy are infra-red waves often called heat waves ? Explain (Physics CBSE 2018)1 AnswerA ir is held inside a non-insulated cylinder using a piston (mass M=25 kg and area A=100 cm2) and stoppers (of negligible area), as shown in the figure. The initial pressure i P and temperature i T of air inside the cylinder are 200 kPa and 400C, respectively. The ambient pressure P and temperature T are 100 kPa and 27C, respectively. The temperature of the air inside the cylinder (C) at which the piston will begin to move is _________ (correct to two decimal places).1 AnswerC apillary waves are generated in the sea. The speed of propagation (C) of these waves is known to be a function of density (ρ), wave length (λ), and surface tension (σ). Assume, ρ and λ to be constant. If the surface tension is doubled, in the functional form of the relevant non-dimensional group, the percentage increase in propagation speed (C) is _______ .0 AnswerWaves inside a gas are1 AnswerThe excess pressure inside a soap bubble is thrice the excess pressure inside a moving soap bubble. What is the ratio between the volume of the first and second bubble? -Physics CBSE class 11 20161 AnswerWhat are gravitational waves ? 0 AnswerAngularJS dependency injection of value inside of module.config0 AnswerWhat do you understand by the statement, ‘‘Electromagnetic waves transport momentum’’ ? (Physics CBSE 2018)1 AnswerThe area of the largest circle, that can be drawn inside a rectangle with sides 18cm by14 cm, is0 AnswerWhich of the following is/are not communication media ? (i) Microwaves (ii) Optical Fiber cable (iii) Node (iv) Radio waves (INFORMATICS-PRACTICES-CBSE-12-2018)1 AnswerHow to redirect stdout and stderr streams to log.txt file from script inside ?0 Answer“So when we see ‘Red”, what we are actually seeing is that portion of the electromagnetic spectrum with a wavelength of about 0.0007 millimeters, in a situation where the other wavelengths are absent. It is our brains (and our language) which inform us it is “red”, and at the same time they often attach cultural labels that tell us it is powerful, or that it is the colour of love, or that it is a traffic sign which means we have to stop”.(NID-2018)1 AnswerAre Parent constructors called implicitly inside a class constructor1 AnswerA ssume a flat earth with crustal thickness of 35 km and average crustal and upper mantle P-wave velocities of 6.4 km.s–1 and 8.1 km.s–1, respectively. The minimum distance from the epicenter of a near surface earthquake at which Pn-waves are observed is _______ km.1 AnswerThe intensity of the gravitational field inside a hollow spherical shell is (NIFT)1 AnswerDistinctions between- ac oustic, ultrasonic, subsonic and supersonic waves?-engineering physics1 AnswerWhat did the pilot of the Dakota encounter 150 kilometers away from Paris? Recount his experience inside the black clouds.CBSE English1 AnswerExplain Matter waves and their Characterist ic properties. -engineering physics1 Answer